When mature, each sac pushes out a process to the exterior, and this forms the genital duct.
The method of working is for the pole to be swung out behind a number of wagons; one engine is then started and with its pole pushes the wagons in front of it until their speed is sufficient to carry them over the points, where they are diverted into any desired siding.
A third pencil traces an observation line in which a kick can be made at will by pressing any one of the electrical pushes placed about the car, and a fourth draws a datum line.
Another blank moved on by the finger L pushes off the finished coin which falls down the tube N.
